Creep Meters- can measure the movement along a slip-strike fault Laser-Ranging Devices- a device that measures changes with a laser beam and a reflector Tiltmeter- measures tilting of the ground; works kind of like a carpenter's level Satellite Monitor- uses radar to take pictures of faults
Outline
Devices that Monitor Faults
geologists use instruments to measure stress and deformation in the crust
Creep Meters
uses a wire stretched across a fault to measure horizontal movement along the fault
one side of fault-wire anchored to post
on other side, wire is attached to weight that slides if fault moves
Laser-Ranging Devices
uses a laser beam to discover tiny fault movements
calculates changes in time needed for the laser beam to travel to a reflector and bounce back
can detect any difference in change through the beam
Tiltmeters
measures tilting of the ground
includes 2 bulbs filled with liquid and is connected to/by a hollow tube
if land rises/falls the liquid will flow from one bulb to another
in bulb is a measuring scale that measures the depth of liquid in bulb
Satellite Monitors
satellite bounces radio waves off the ground
satellite records the echos of the waves that bounced back into space
amount of time it took for the radio waves to make their way back and forth is the precise measurements of distance to ground
geologists can detect small changes in elevation
Monitoring Risk in the United States
geologist can't predict when and where the earthquake will strike
but geologists can determine earthquake risk by locating where faults are active and where past earthquakes have occurred
Table of Contents
2.4 Monitoring Earthquakes
Vocabulary
Creep Meters- can measure the movement along a slip-strike fault
Laser-Ranging Devices- a device that measures changes with a laser beam and a reflector
Tiltmeter- measures tilting of the ground; works kind of like a carpenter's level
Satellite Monitor- uses radar to take pictures of faults
Outline
Devices that Monitor Faults
Monitoring Risk in the United States
Diagram(s)